i bought a whole set of flush sets, but that was for my pneumatic squeezer, which didn't have an adjustable set holder. the different sizes work well with a washer here and there to get the correct spacing. i've since installed an adjustable set holder (SO much better than washers), and only use my favorite flush set in it. the others get used every once in a while in my hand squeezer when the adjustable set won't quite get the correct spacing.